Isuzu Cars and Trucks 1981-1991

Early Fuel Evaporation System

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The early fuel evaporation system consists of the EFE heater, electronic control module, coolant temperature sensor and the EFE relay.

The EFE heater is equipped with a ceramic ring which is located below the primary carburetor bore. The ring is an internal part of the carburetor gasket.

The EFE heats the incoming air charge to improve atomization. This offers better cold start and driveaway performance.

The coolant temperature sensor is activated when the ignition switch is turned to the ON position and the engine is started. If the engine coolant temperature is below the specified value, the ECM will supply current from the battery to the coils in the EFE heater to heat the incoming fuel/air charge.



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Fig. Early Fuel Evaporative (EFE) system after 1988 all systems are ECM controlled

REMOVAL AND INSTALLATION
  1. Disconnect the negative battery cable.
  2.  
  3. Remove the air cleaner assembly.
  4.  
  5. Remove the carburetor as outlined in .
  6.  
  7. Disconnect and remove the EFE heater and gaskets.
  8.  

To install:

  1. Install the heater with new gaskets.
  2.  
  3. Install the carburetor and torque the nuts as outlined in .
  4.  
  5. Install the air cleaner, connect the battery cable, start the engine and check operation.
  6.  

 
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